24 down
Mercury
makes
tree
gain
temperature?
(6)
Mercury makes tree gain temperature? (6)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
The definition by example is Mercury — the question mark signals it's giving you an instance rather than a straight definition. PLANE, a type of tree, gains T (the abbreviation for temperature) to give you your answer.